Hello all. I have the input files of a protein (.cor, .psf, .top, .prm files) and I have also the same files of another different protein and I am using Charmm. Now I want to check the interaction between those two protein. For this, I think I need to join or append the four inputs file of the two proteins together? so that I can simulate them both at a time or is there any other convenient way to do that? I will be thankful if I get some suggestions regarding this. Thanks.